Fast light in sky moving horizontal, and too fast for normal military of commercial traffic

I observed a light that was travelling horizontal to the ground at a high rate of speed from north to south toward John Wayne airport. Slower than a falling star, but much faster that commercial air traffic and faster than normal military jets.

There was some jet noise, but not nearly as loud as most jets, there were also some commercial jets in the area.

My conclusion is that this was either a very low flying, very fast, and very quiet military jet or ???. It was flying in airspace that is between the two typical patterns for planes landing at John Wayne airport, but in the same general direction.